正则表达式中使用变量赋值

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1. <scriptlanguage="javascript">functioncheck(){varstr=document.getElementById("input1").valuevars="^正则表达式$"varre=newRegExp(s,"ig");alert(re.test(str))}</script><inputid="input1"value="正则表达式"><inputtype="button"value="确定"onclick="check()">============================<scriptlanguage="javascript">functioncheck2(){varstr2=document.getElementById("input2").valuevars2="正则表达式"varre=eval("/^"+s2+"$/ig")alert(re.test(str2))}</script><inputid="input2"value="正则表达式"><inputtype="button"value="确定"onclick="check2()">